Heater not working

My heater blower is not working in my 1988 300 sel. I have checked all the fuses and they are okay. The blower is okay as well, I ran a wire to the blower from the battery and it came on, but when the wires are connected and i push the fan buttons it doesn't come on.

The heater blower on my Merc 220 CDI dosnt work at all, are there any fuses or relays I should check.

Ther does seem to be a "electrical whirring coming from the engine when the blower is on as well! everything esle works!

The heater blower on my Merc 220 CDI dosnt work at all, are there any fuses or relays I should check.
Ther does seem to be a "electrical whirring coming from the engine when the blower is on as well! everything esle works!

The heater blower on my merc 220 cdi does not work in any position, are there fuses or relays I should check!The heater blower on my merc 220 cdi does not work in any position, are there fuses or relays I should check!

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CHECK AC AND HEATER CONTROL FUSE. IF FUSE OKAY CHECK BLOWER SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR MORE LIKELY FAULTY.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR FUSE ANDRELAY.

CHECK SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR EITHER BAD OR HAS POOR GROUND SHORT IN WIRING CONNECTOR GOING TO BLOWER MOTOR AND RESISTOR.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR 30 AMP FUSE OR RELAY.IF BLOWER MOTOR OKAY AND FUSE RELAY OKAY THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

CHECK BLOWER MOTOR RELAY ALSO, AND USE A TEST LIGHT TO SEE IF POWER GOING TO BLOWER MOTOR, IF YES BLOWER MOTOR FAULTY.IF NO POWER GOING TO BLOWER MOTOR AND FUSE AND RELAY OKAY CONTROL SWITCH COULD BE BAD,A RESISTOR BAD MOST OF THE TIME IF YOU DONT HAVE BUT A FEW FAN BLOWER CONTROL SPEEDS.

CHECK BLOWER MOTOR FUSE AND RELAY.SEE IF POWER GOING TO BLOWER MOTOR YOU HAVE FAULTY BLOWER MOTOR.IF BLOWER MOTOR FUSE AND RELAY OKAY.IF NO POWER GOING TO BLOWER MOTOR BUT POWER AT AC AND HEATER CONTROL SWITCH. BLOWER MOTOR HAS POOR GROUND OR AC AND HEATER CONTROL SWITCH IS BAD.